How To Troubleshoot and Fix a Mini Split P1 Error Code

By | May 1, 2019

How To Troubleshoot and Fix a Mini Split P1 Error Code
If a P1 error code displays on a mini split air conditioner there are a few things a DIY type person can do before calling an HVAC tech.

Of course if in-doubt always call a professional.

Below are the steps to troubleshoot and fix an P1 error code.

What is a P1 Error Code on a Mini Split?
A P1 code is an Over Voltage or Low Voltage Protection.

This usually indicates there is a voltage problem in the unit.

What Causes a P2 Code on a Mini Split?

  • Bad Power Supply
  • Power From Circuit Breaker Wrong
  • System Leakage or Blockage
  • Loose Connections
  • Main PCB Board

The main control board is programed to send out a P1 code when a low or high voltage is detected.

This includes the power supply in the unit or from that circuit breaker.

Several things can cause this error with the steps below for what to check.

Steps to Troubleshoot and Fix a P1 code

  1. The first thing to check is if the unit is getting the correct voltage from the circuit breaker (115 or 230 volts AC).
  2.  

  3. Check the power wires on the outside condenser and be sure they have a good connection.
  4.  

  5. Check the control wires on the inside unit and be sure they have a good connection.
  6.  

  7. Check the power going to the main PCB board is correct.
  8.  

When a mini split unit gives this error checking to see if the correct voltage is going to the main PCB needs to be done to troubleshoot a P1 code.

Check the main voltage going to the unit as well as the power supply.

Keep in mind If the power supply is bad this can damaged a PCB board.

Once the problem components are found they must be replaced.



 




 

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